نتایج جستجو برای: volterras population model

تعداد نتایج: 2697164  

2002
Brian Dennis

The Allee effect, or inverse density dependence at low population sizes, could seriously impact preservation and management of biological populations. The mounting evidence for widespread Allee effects has lately inspired theoretical studies of how Allee effects alter population dynamics. However, the recent mathematical models of Allee effects have been missing another important force prevalen...

2014
Zongcheng Li Qingli Zhao Di Liang

2017
Damien Passemier Jian-Feng Yao DAMIEN PASSEMIER JIAN-FENG YAO

2011
Zoltán VARGA Zoltán SEBESTYÉN Manuel GÁMEZ Tomás CABELLO Anna ATTIAS

The paper is an overview of our recent results achieved with different coauthors, concerning several research lines of applied population dynamics we initiated some years ago, and mostly published in 2010. First, based on the classical Leslie population model, a dynamic demographic model including controlled immigration is recalled, and applying the Perron-Frobenius theory of nonnegative matric...

2013
Nidhi Parikh

Synthetic populations attempt to capture population dynamics of a geographic region and hence are widely used in large-scale multiagent applications simulating real-world phenomena. However, current synthetic populations are mostly static — individuals are assumed to perform same daily routine every day. My thesis aims at taking the first step towards making it a “live” synthetic population tha...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت مدرس - دانشکده مهندسی 1387

abstract this paper discusses several commonly used models for strategic marketing¹ including market environmental analysis methods (i.e. swot and pest analysis) and strategic marketing tools and techniques (i.e. boston matrix and shell directional policy matrix)and shows how these models may help a firm to achieve its strategic goals. at first, the main reason for doing this research is de...

Journal: :Bangladesh Journal of Scientific Research 2012

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه بیرجند - دانشکده علوم 1391

in this thesis, we consider a mathematical model of cancer with completely unknown parameters. we study the stability of critical points which are biologically admissible. then we consider a control on the system and introduce situations at which solutions are attracted to critical points and so the cancer disease has auto healing. the lyapunov stability method is used for estimating the un...

2013
Nidhi Kiranbhai Parikh

Synthetic populations attempt to capture population dynamics of a geographic region and hence are widely used in large-scale multiagent applications simulating real-world phenomena. However, current synthetic populations are mostly static — individuals are assumed to perform same daily routine every day. My thesis aims at taking the first step towards making it a “live” synthetic population tha...

Journal: :iranian journal of science and technology (sciences) 2014
r. khoshsiar ghaziani

this paper investigates the dynamics and stability properties of a discrete-time lotka-volterra type system. we first analyze stability of the fixed points and the existence of local bifurcations. our analysis shows the presence of rich variety of local bifurcations, namely, stable fixed points; in which population numbers remain constant, periodic cycles; in which population numbers oscillate amo...

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